if it is building boost so quick why are you still seeing vacuum? At idle you should be seeing 15-20 inch of vacuum, from there at any throttle you should be seeing less vac and then going into boost. you may want to try another gauge. if you are over boosting it will seem like misfire and...
you may have a leak in your intercooler piping, if you blew a hose or have any crack in the line it is not reading it thru the maf. may want to check that closely
We usually meet on the Saturday Afternoon, I am hoping to have the same place to meet as last year. I will post location on Facebook, Dirty South GNs .
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Thanks Keith